i need some input on a problem ive come across. i just switched my intake from the injen to another intake and uicp. afr at wot is about the same, not much change there. but now im getting the bov flutter with my stock 9 bov. this has never happend before. driving through the gears, if i slowly let off the gas, my afr goes to 10.0 and the car stumbles a bit, nothing violent but a little stutter. i checked all the connections and there all good, and the bov is installed correctly. if i listen in the engine bay and tap the gas, i can hear a little ringing noise just as the rpms come back down and start to settle at idle again. the car is pulling good like usual but it seems like my bov went bad out of nowhere. one other issue, occasionally when i ease into boost and i hear the turbo spooling, i start to here the turbo spool fluctuating. its really hard to describe the noise, best description would be if you were to blow air out of your mouth and rapidly wave your hand through the flowing air over and over. im getting some parts installed and then retuned on thursday, and i want to ensure that everything is 100% before the parts go on. any input would be appreciated

 

no help?

 

im having a very similar problem... i just installed a perrin manual boost controller and my BOV is a greddy RS. my flutter happens only after 4000rpms + and and only at about 50% throttle